Garmin's known for making excellent GPS navigation systems for cars, the good news is that they've put that same effort into making lightweight, accurate and bike-specific models available. Garmins bike GPS systems, like their Edge line keep track of where you are, keep tabs on you as you explore un-navigated trails or roads while keeping you aware of your pace, cadence and, at times, your heart rate. Garmin's heart rate monitors connect directly to the bike computer/ GPS navigation system and keep track of your effort as you ride.